Complementarity and Substitution in the Theory of Capital

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…is not in static equilibrium. It is useless to view capital change as quantitative change in one factor and supposing that other factors remain constant. An important topic in the capital theory is the internal capital change, which is the reorder of existing capital for unexpected change. And finally, all that has been mentioned is not only essential in the theory of capital, but also has a great importance in the theory of industrial fluctuation.